AI-generatedSion at a glance
- Best time
- May – Oct
- Warmest month
- Jul · 25°
- Sunshine a year
- 2,160 h
- Rain a year
- 1,630 mm
- Climate
- Continental
- Time zone
- UTC+1 / UTC+2
- Elevation
- 500 m
Climate in Sion
Sion has warm to hot summers and cold winters with occasional snow. July is the warmest month with average highs of 25 °C, while January is the coolest at 4 °C. With around 2,160 hours of sunshine a year, Sion is moderately sunny; July is the sunniest month with 8.7 hours a day.
Holiday weather through the year
Weather in October
Holiday weather in October
Good
Best time to visit: May – October
Good forSightseeing & walks
A typical day in October
- Morning, 08:00: about 7°
- Midday, 13:00: about 16°
- Afternoon, 16:00: about 17°
- Evening, 20:00: about 13°
- Night, 23:00: about 10°
07:4618:46
Cool evenings: pack a jumper or a jacket.
Estimated from the average high and low: coolest around sunrise, warmest in mid-afternoon.
Light for photos in October
- Golden hour
- Morning 07:27–08:27 · evening 18:06–19:05
- Blue hour
- Morning 07:16–07:27 · evening 19:05–19:17
Golden hour: the sun between 4° below and 6° above the horizon; blue hour: 6° to 4° below it. Times for the 15th of the month; mountains and clouds shift the light.
What is the weather like in Sion in October?
In October, Sion is mild: daytime highs average 17 °C, and nights cool down to about 6 °C. Expect around 5 hours of sunshine a day. Rain is frequent, with about 13 rainy days and 116 mm in total. Snow falls on about 2 days. All in all, October is a good month for a holiday in Sion.
More details for October
- Daylight
- 11 h 0 min07:46 – 18:46
- UV index
- 3 · moderateclear sky, noon (estimate)All months
- Muggy days
- 0 daysdew point 18 °C or moreAll months
- Wind
- 8 km/haverage daily peakAll months
- Cloud cover
- 66 %on averageAll months
- Hot days
- 0 days30 °C or moreAll months
- Snow days
- 2 days1 cm or more of fresh snowAll months
- Time zone
- UTC+2Europe/Zurich
How the score comes together
- Temperatureweight 50 %100 %
- Sunshineweight 20 %37 %
- Few rainy daysweight 30 %36 %
Each factor is rated from 0 to 100 % and weighted for the travel style “Mountain air”.
What to pack in October
- A jumper for the evenings
- Rain jacket or umbrella
Sunshine hours in Sion
Average hours of bright sunshine per day, next to the length of the day. Tap a month to select it.
In October, the sun shines for about 5.2 of 11.0 hours of daylight in Sion, 47 % of the day.
Sunshine hours: measured at the weather station 2 km away, averages 1991–2020 (WMO climate normals). Daylight is the time from sunrise to sunset on the 15th of the month.
UV index in Sion
How strong the sun is at noon, month by month, and how quickly unprotected skin burns.
- Clear-sky UV in October
- 3 · moderateAround midday seek shade; use sunscreen, a hat and sunglasses.
The sun is strongest in June (UV 9).
Minutes until sunburn in October
- Very fair skin
- about 45 min
- Fair skin
- about 55 min
- Light brown skin
- about 80 min
- Olive skin
- about 105 min
Rough guide for unprotected skin at noon under a clear sky; clouds lengthen it, water, sand and snow shorten it. Sunscreen extends the time only partly.
Monthly values: clear-sky noon estimate from the sun's angle, ozone and altitude. UV today: Open-Meteo forecast.
Rain in Sion: rainy days and rainfall
A rainy day is a day with at least 1 mm of rain or snow; the amount is what falls in the whole month. Tap a month to select it.
In October, Sion has about 13 rainy days with 116 mm of rain in total.
Wind and clouds in Sion
How breezy and how cloudy Sion is through the year. Tap a month to select it on the whole page.
Wind
Typical daily peak of the wind in km/h: what the afternoon breeze usually reaches, not the gusts.
In October, the wind in Sion typically peaks at 8 km/h during the day: Beaufort 2, light air.
Clouds
Average share of the sky covered by cloud, day and night.
In October, cloud covers on average 66 % of the sky over Sion: mostly cloudy, with about 5.2 hours of sunshine a day.
Wind: mean daily maximum of the hourly wind 10 m above ground (ERA5, 1996–2025). Gusts are stronger, and the model grid of about 28 km smooths out local effects such as capes and valley winds. Clouds: mean total cloud cover of all layers over day and night (ERA5, 1996–2025). Thin high cloud counts as cover even when the sun still shines through.
Heat and humidity in Sion
How often the day gets hot in Sion (30 °C and more), and in which months heat and humidity come together. Tap a month to select it.
Heat calendar
- pleasant
- some hot or muggy days
- often muggy
- often hot
- hot and muggy
In October, Sion has about 0 hot days, with an average daytime high of 17 °C: pleasant. Heat plays no part this month.
Hot days reach at least 30 °C; a month counts as muggy when the mean dew point reaches 18 °C on at least 15 days. Averages from ERA5 and ERA5-Land, 1996–2025. Muggy nights through the year
Snow in Sion
When Sion is likely to be white: the chance of seeing snow during a week's stay, the days with fresh snow and how much falls. Tap a month to select it.
Snow calendar
- hardly any
- possible
- likely
- very likely
In October, Sion has about 2 days with at least 1 cm of fresh snow, 8 cm in total. The chance of seeing snow during a week's stay is 22 out of 100: possible.
Snow days bring at least 1 cm of fresh snow. Fresh snow comes from ERA5 snowfall (1996–2025) at the height of the place, not on the slopes above it; the snow chance also weighs whether the snow settles. An estimate from climate averages, not a snow report.
Climate through the year
Long-term monthly averages. Tap a month to see its details.
Nights and sleep in Sion
How warm the nights get in each month, from the mean night-time low. Tap a month for details.
- Frost below 0°
- Cold 0–8°
- Cool 8–15°
ColdOctober: nights around 6°. The room should be heated.
The coolest nights are in January (−6°), the warmest in July (14°). Nights fall below 8 °C on average from October to April, so the room should be heated.
Temperatures through the year
Average daytime high, night-time low and sea temperature per month.
| Month | Score | Day | Night | Sun | Rain days | Rain mm |
|---|---|---|---|---|---|---|
| JanuaryJan | 9 | 4° | −6° | 3.0 h | 14 | 124 |
| FebruaryFeb | 20 | 6° | −4° | 4.6 h | 12 | 106 |
| MarchMar | 39 | 10° | 0° | 6.1 h | 14 | 113 |
| AprilApr | 57 | 13° | 4° | 7.0 h | 15 | 117 |
| MayMay | 65 | 18° | 8° | 7.4 h | 19 | 167 |
| JuneJun | 70 | 23° | 13° | 8.5 h | 17 | 153 |
| JulyJul | 71 | 25° | 14° | 8.7 h | 17 | 173 |
| AugustAug | 72 | 25° | 14° | 8.1 h | 16 | 163 |
| SeptemberSep | 73 | 21° | 11° | 6.9 h | 13 | 126 |
| OctoberOct | 68 | 17° | 6° | 5.2 h | 13 | 116 |
| NovemberNov | 27 | 10° | 0° | 3.2 h | 14 | 132 |
| DecemberDec | 8 | 4° | −5° | 2.2 h | 14 | 141 |
Climate averages 1996–2025, not a forecast. Data: Copernicus ERA5 / ERA5-Land via Open-Meteo.com (CC BY 4.0), NOAA OISST, WMO 1991–2020 (NOAA NCEI), GeoNames (CC BY 4.0). Sources & licences
46.23° N, 7.36° E · 500 m · Europe/Zurich
Best time to visit Sion
The best time to visit Sion is from May to October. Hiking and mountain trips are best from May to October, when the trails are largely free of snow. Rain is most frequent in May; the wettest month is July with 173 mm.
Sion through the seasons
How the weather changes over the seasons, with averages for each.
Sion in spring
Mar – May
Fair
- 10–18 °C by day
- 7 h of sun a day
- 47 rainy days in all
Sion in summer
Jun – Aug
Good
- 23–25 °C by day
- 8 h of sun a day
- 50 rainy days in all
Sion in autumn
Sep – Nov
Fair
- 10–21 °C by day
- 5 h of sun a day
- 40 rainy days in all
Sion in winter
Dec – Feb
Poor
- 4–6 °C by day
- 3 h of sun a day
- 40 rainy days in all
Find your perfect month
Tell us what you like and we rate every month in Sion for you.
Your best months: May – June, September
Based on the climate averages; tap a month to see its details.
Compare two months in Sion
Pick two months to see how the weather differs. A tick marks the clearly better value; for temperatures it depends on your plans.
September has the better holiday weather in Sion: score 73 against 68. In September, days are 4 °C warmer than in October. The sun shines 2 hours longer a day in September.
| Month | October | September |
|---|---|---|
| Weather score | 68 | 73better |
| Day high | 17° | 21° |
| Night low | 6° | 11° |
| Sunshine | 5.2 h | 6.9 hbetter |
| Rainy days | 13 | 13 |
| Rainfall | 116 mmbetter | 126 mm |
Based on the climate averages 1996–2025.
Which month for what?
Hiking & mountain trips
May – Oct
13–27 °C in the village, little snow
Rainy months
May
18 or more rainy days, often short showers and storms
Snow
Nov – Apr
Snow on 2 or more days
Sion month by month
The typical weather for every month at a glance.
9January4° · 3 h
In January, Sion is cold: daytime highs average 4 °C, and nights often drop below freezing (−6 °C). The sun is scarce, with only about 3 hours a day. Precipitation, often as snow, falls on about 14 days, totalling 124 mm. Snow falls on about 10 days. All in all, January is not an ideal month for a holiday in Sion.
Sion in January20February6° · 5 h
In February, Sion is cold: daytime highs average 6 °C, and nights often drop below freezing (−4 °C). Expect around 5 hours of sunshine a day. Rain is frequent, with about 12 rainy days and 106 mm in total. Snow falls on about 9 days. All in all, February is not an ideal month for a holiday in Sion.
Sion in February39March10° · 6 h
In March, Sion is cold: daytime highs average 10 °C, and nights cool down to about 0 °C. Expect around 6 hours of sunshine a day. Rain is frequent, with about 14 rainy days and 113 mm in total. Snow falls on about 8 days. All in all, March is not an ideal month for a holiday in Sion.
Sion in March57April13° · 7 h
In April, Sion is cool: daytime highs average 13 °C, and nights cool down to about 4 °C. The sun shines for around 7 hours a day. It rains often – on about 15 days, adding up to 117 mm. Snow falls on about 5 days. All in all, April is a so-so month for a holiday in Sion.
Sion in April65May18° · 7 h
In May, Sion is mild: daytime highs average 18 °C, and nights cool down to about 8 °C. The sun shines for around 7 hours a day. It rains often – on about 19 days, adding up to 167 mm. All in all, May is a good month for a holiday in Sion.
Sion in May70June23° · 9 h
In June, Sion is warm: daytime highs average 23 °C, and nights cool down to about 13 °C. The sun shines for around 9 hours a day. It rains often – on about 17 days, adding up to 153 mm. All in all, June is a good month for a holiday in Sion.
Sion in June71July25° · 9 h
In July, Sion is warm: daytime highs average 25 °C, and nights cool down to about 14 °C. The sun shines for around 9 hours a day. It rains often – on about 17 days, adding up to 173 mm. All in all, July is a good month for a holiday in Sion.
Sion in July72August25° · 8 h
In August, Sion is warm: daytime highs average 25 °C, and nights cool down to about 14 °C. The sun shines for around 8 hours a day. It rains often – on about 16 days, adding up to 163 mm. All in all, August is a good month for a holiday in Sion.
Sion in August73September21° · 7 h
In September, Sion is mild: daytime highs average 21 °C, and nights cool down to about 11 °C. The sun shines for around 7 hours a day. Rain is frequent, with about 13 rainy days and 126 mm in total. All in all, September is a good month for a holiday in Sion.
Sion in September68October17° · 5 h
In October, Sion is mild: daytime highs average 17 °C, and nights cool down to about 6 °C. Expect around 5 hours of sunshine a day. Rain is frequent, with about 13 rainy days and 116 mm in total. Snow falls on about 2 days. All in all, October is a good month for a holiday in Sion.
Sion in October27November10° · 3 h
In November, Sion is cold: daytime highs average 10 °C, and nights often drop below freezing (0 °C). The sun is scarce, with only about 3 hours a day. It rains often – on about 14 days, adding up to 132 mm. Snow falls on about 7 days. All in all, November is not an ideal month for a holiday in Sion.
Sion in November8December4° · 2 h
In December, Sion is cold: daytime highs average 4 °C, and nights often drop below freezing (−5 °C). The sun is scarce, with only about 2 hours a day. It rains often – on about 14 days, adding up to 141 mm. Snow falls on about 10 days. All in all, December is not an ideal month for a holiday in Sion.
Sion in DecemberSion compared
Put Sion side by side with another destination.
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Sion vs. Crans-Montana
In October Sion has the better holiday weather (score 68 vs. 39). During the day Crans-Montana is 7 °C cooler than Sion.
| in October | Sion | Crans-Montana |
|---|---|---|
| Holiday score | 68 | 39 |
| Daytime high | 17° | 10° |
| Sunshine | 5 h | 5 h |
| Rainy days | 13 | 13 |
| Best time | May – Oct | Jun – Sep |
Through the year
Switzerland in October: the best places
In October, Sion ranks 4 among the 31 nearest destinations in this country.
- Locarno17°69
- 2Lugano17°69
- 3Bellinzona17°69
- 4SionThis page17°68
- 5Montreux16°68
- 6Interlaken15°60
- 7Glarus16°60
- 8Vevey16°59
Planning a trip to Sion
Weather for your travel dates
Pick your arrival and length of stay, and we sum up the weather to expect.
Sion in the school holidays
How the weather suits the usual holiday periods. Dates vary by school and region, so each holiday uses the months it usually falls in.
Sion has its best school-holiday weather during the summer holidays (score 72) and its weakest during the Christmas holidays (score 9).
- 52
Easter holidays
Mar – Apr
Fair
- 12 °C by day
- 6.7 h of sun a day
- 14 rainy days a month
Keep in mind: Snow
- 66
May half-term
May – Jun
Good
- 19 °C by day
- 7.6 h of sun a day
- 18 rainy days a month
Good for: Sightseeing & walks
Keep in mind: Frequent rain
- 72
Summer holidays
Jul – Aug
GoodBest holidays
- 25 °C by day
- 8.3 h of sun a day
- 16 rainy days a month
Good for: Sightseeing & walks
- 68
October half-term
Oct
Good
- 17 °C by day
- 5.2 h of sun a day
- 13 rainy days a month
Good for: Sightseeing & walks
- 9
Christmas holidays
Dec – Jan
Poor
- 4 °C by day
- 2.6 h of sun a day
- 14 rainy days a month
Keep in mind: Snow
Based on the climate averages 1996–2025.
Getting there
Flying from
- Nonstop flight
- about 1 h 30 min
- Distance
- 820 km
- Time zone
- UTC+2
- Jet lag
- Hardly any (under 3 h)
Estimated from the straight-line distance: 30 minutes for take-off and landing plus 830 km/h cruising speed.
Frequently asked questions about Sion
When is the best time to visit Sion?
The best time to visit Sion is from May to October. That is when the holiday weather score, which combines temperature, sea, sunshine and rain, is highest.
What is the warmest month in Sion?
July is the warmest month, with average highs of 25 °C and nights around 14 °C. January is the coolest month at 4 °C.
When does it rain most in Sion?
Rain is most frequent in May; the wettest month is July with 173 mm. The driest month is February with 106 mm.
How many hours of sunshine does Sion get?
Sion gets around 2,160 hours of sunshine a year. The sunniest month is July with 8.7 hours a day; in December there are 2.2 hours a day.
What time zone is Sion in?
Sion uses the time zone Europe/Zurich: UTC+1 in January and UTC+2 in July.
How long is the flight from London to Sion?
A nonstop flight from London to Sion takes about 1 h 30 min, for a straight-line distance of about 820 km.
Which school holidays are best for Sion?
Sion has its best school-holiday weather during the summer holidays (score 72) and its weakest during the Christmas holidays (score 9). Holiday ratings (0–100): Easter holidays 52, May half-term 66, Summer holidays 72, October half-term 68, Christmas holidays 9.
Near Sion
Other destinations close by.
Places with a climate like Sion
Destinations whose weather through the year is closest to Sion's – good alternatives.